From the given sentences (1) (2) and (3), find the sentences most appropriate to connect the given sentences. According to your assessment mark the option corresponding to the right answer. If there is no correct answer, mark ‘None of these’.

A. You must only buy appliances with a star rating.

B. Star rated appliances conserve electricity.

1. ...with a star rating because...

2. ...with a star rating since...

3. ...with a star rating therefore...